drivers/media/platform/vimc/vimc-capture.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * vimc-capture.c Virtual Media Controller Driver
   4  *
   5  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
   6  */
   7
   8 #include <media/v4l2-ioctl.h>
   9 #include <media/videobuf2-core.h>
  10 #include <media/videobuf2-vmalloc.h>
  11
  12 #include "vimc-common.h"
  13 #include "vimc-streamer.h"
  14
  15 struct vimc_cap_device {
  16         struct vimc_ent_device ved;
  17         struct video_device vdev;
  18         struct v4l2_pix_format format;
  19         struct vb2_queue queue;
  20         struct list_head buf_list;
  21         /*
  22          * NOTE: in a real driver, a spin lock must be used to access the
  23          * queue because the frames are generated from a hardware interruption
  24          * and the isr is not allowed to sleep.
  25          * Even if it is not necessary a spinlock in the vimc driver, we
  26          * use it here as a code reference
  27          */
  28         spinlock_t qlock;
  29         struct mutex lock;
  30         u32 sequence;
  31         struct vimc_stream stream;
  32         struct media_pad pad;
  33 };
  34
  35 static const struct v4l2_pix_format fmt_default = {
  36         .width = 640,
  37         .height = 480,
  38         .pixelformat = V4L2_PIX_FMT_RGB24,
  39         .field = V4L2_FIELD_NONE,
  40         .colorspace = V4L2_COLORSPACE_DEFAULT,
  41 };
  42
  43 struct vimc_cap_buffer {
  44         /*
  45          * struct vb2_v4l2_buffer must be the first element
  46          * the videobuf2 framework will allocate this struct based on
  47          * buf_struct_size and use the first sizeof(struct vb2_buffer) bytes of
  48          * memory as a vb2_buffer
  49          */
  50         struct vb2_v4l2_buffer vb2;
  51         struct list_head list;
  52 };
  53
  54 static int vimc_cap_querycap(struct file *file, void *priv,
  55                              struct v4l2_capability *cap)
  56 {
  57         strscpy(cap->driver, VIMC_PDEV_NAME, sizeof(cap->driver));
  58         strscpy(cap->card, KBUILD_MODNAME, sizeof(cap->card));
  59         snprintf(cap->bus_info, sizeof(cap->bus_info),
  60                  "platform:%s", VIMC_PDEV_NAME);
  61
  62         return 0;
  63 }
  64
  65 static void vimc_cap_get_format(struct vimc_ent_device *ved,
  66                                 struct v4l2_pix_format *fmt)
  67 {
  68         struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
  69                                                     ved);
  70
  71         *fmt = vcap->format;
  72 }
  73
  74 static int vimc_cap_g_fmt_vid_cap(struct file *file, void *priv,
  75                                   struct v4l2_format *f)
  76 {
  77         struct vimc_cap_device *vcap = video_drvdata(file);
  78
  79         f->fmt.pix = vcap->format;
  80
  81         return 0;
  82 }
  83
  84 static int vimc_cap_try_fmt_vid_cap(struct file *file, void *priv,
  85                                     struct v4l2_format *f)
  86 {
  87         struct v4l2_pix_format *format = &f->fmt.pix;
  88         const struct vimc_pix_map *vpix;
  89
  90         format->width = clamp_t(u32, format->width, VIMC_FRAME_MIN_WIDTH,
  91                                 VIMC_FRAME_MAX_WIDTH) & ~1;
  92         format->height = clamp_t(u32, format->height, VIMC_FRAME_MIN_HEIGHT,
  93                                  VIMC_FRAME_MAX_HEIGHT) & ~1;
  94
  95         /* Don't accept a pixelformat that is not on the table */
  96         vpix = vimc_pix_map_by_pixelformat(format->pixelformat);
  97         if (!vpix) {
  98                 format->pixelformat = fmt_default.pixelformat;
  99                 vpix = vimc_pix_map_by_pixelformat(format->pixelformat);
 100         }
 101         /* TODO: Add support for custom bytesperline values */
 102         format->bytesperline = format->width * vpix->bpp;
 103         format->sizeimage = format->bytesperline * format->height;
 104
 105         if (format->field == V4L2_FIELD_ANY)
 106                 format->field = fmt_default.field;
 107
 108         vimc_colorimetry_clamp(format);
 109
 110         return 0;
 111 }
 112
 113 static int vimc_cap_s_fmt_vid_cap(struct file *file, void *priv,
 114                                   struct v4l2_format *f)
 115 {
 116         struct vimc_cap_device *vcap = video_drvdata(file);
 117         int ret;
 118
 119         /* Do not change the format while stream is on */
 120         if (vb2_is_busy(&vcap->queue))
 121                 return -EBUSY;
 122
 123         ret = vimc_cap_try_fmt_vid_cap(file, priv, f);
 124         if (ret)
 125                 return ret;
 126
 127         dev_dbg(vcap->ved.dev, "%s: format update: "
 128                 "old:%dx%d (0x%x, %d, %d, %d, %d) "
 129                 "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vcap->vdev.name,
 130                 /* old */
 131                 vcap->format.width, vcap->format.height,
 132                 vcap->format.pixelformat, vcap->format.colorspace,
 133                 vcap->format.quantization, vcap->format.xfer_func,
 134                 vcap->format.ycbcr_enc,
 135                 /* new */
 136                 f->fmt.pix.width, f->fmt.pix.height,
 137                 f->fmt.pix.pixelformat, f->fmt.pix.colorspace,
 138                 f->fmt.pix.quantization, f->fmt.pix.xfer_func,
 139                 f->fmt.pix.ycbcr_enc);
 140
 141         vcap->format = f->fmt.pix;
 142
 143         return 0;
 144 }
 145
 146 static int vimc_cap_enum_fmt_vid_cap(struct file *file, void *priv,
 147                                      struct v4l2_fmtdesc *f)
 148 {
 149         const struct vimc_pix_map *vpix = vimc_pix_map_by_index(f->index);
 150
 151         if (!vpix)
 152                 return -EINVAL;
 153
 154         f->pixelformat = vpix->pixelformat;
 155
 156         return 0;
 157 }
 158
 159 static int vimc_cap_enum_framesizes(struct file *file, void *fh,
 160                                     struct v4l2_frmsizeenum *fsize)
 161 {
 162         const struct vimc_pix_map *vpix;
 163
 164         if (fsize->index)
 165                 return -EINVAL;
 166
 167         /* Only accept code in the pix map table */
 168         vpix = vimc_pix_map_by_code(fsize->pixel_format);
 169         if (!vpix)
 170                 return -EINVAL;
 171
 172         fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
 173         fsize->stepwise.min_width = VIMC_FRAME_MIN_WIDTH;
 174         fsize->stepwise.max_width = VIMC_FRAME_MAX_WIDTH;
 175         fsize->stepwise.min_height = VIMC_FRAME_MIN_HEIGHT;
 176         fsize->stepwise.max_height = VIMC_FRAME_MAX_HEIGHT;
 177         fsize->stepwise.step_width = 1;
 178         fsize->stepwise.step_height = 1;
 179
 180         return 0;
 181 }
 182
 183 static const struct v4l2_file_operations vimc_cap_fops = {
 184         .owner          = THIS_MODULE,
 185         .open           = v4l2_fh_open,
 186         .release        = vb2_fop_release,
 187         .read           = vb2_fop_read,
 188         .poll           = vb2_fop_poll,
 189         .unlocked_ioctl = video_ioctl2,
 190         .mmap           = vb2_fop_mmap,
 191 };
 192
 193 static const struct v4l2_ioctl_ops vimc_cap_ioctl_ops = {
 194         .vidioc_querycap = vimc_cap_querycap,
 195
 196         .vidioc_g_fmt_vid_cap = vimc_cap_g_fmt_vid_cap,
 197         .vidioc_s_fmt_vid_cap = vimc_cap_s_fmt_vid_cap,
 198         .vidioc_try_fmt_vid_cap = vimc_cap_try_fmt_vid_cap,
 199         .vidioc_enum_fmt_vid_cap = vimc_cap_enum_fmt_vid_cap,
 200         .vidioc_enum_framesizes = vimc_cap_enum_framesizes,
 201
 202         .vidioc_reqbufs = vb2_ioctl_reqbufs,
 203         .vidioc_create_bufs = vb2_ioctl_create_bufs,
 204         .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
 205         .vidioc_querybuf = vb2_ioctl_querybuf,
 206         .vidioc_qbuf = vb2_ioctl_qbuf,
 207         .vidioc_dqbuf = vb2_ioctl_dqbuf,
 208         .vidioc_expbuf = vb2_ioctl_expbuf,
 209         .vidioc_streamon = vb2_ioctl_streamon,
 210         .vidioc_streamoff = vb2_ioctl_streamoff,
 211 };
 212
 213 static void vimc_cap_return_all_buffers(struct vimc_cap_device *vcap,
 214                                         enum vb2_buffer_state state)
 215 {
 216         struct vimc_cap_buffer *vbuf, *node;
 217
 218         spin_lock(&vcap->qlock);
 219
 220         list_for_each_entry_safe(vbuf, node, &vcap->buf_list, list) {
 221                 list_del(&vbuf->list);
 222                 vb2_buffer_done(&vbuf->vb2.vb2_buf, state);
 223         }
 224
 225         spin_unlock(&vcap->qlock);
 226 }
 227
 228 static int vimc_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
 229 {
 230         struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
 231         struct media_entity *entity = &vcap->vdev.entity;
 232         int ret;
 233
 234         vcap->sequence = 0;
 235
 236         /* Start the media pipeline */
 237         ret = media_pipeline_start(entity, &vcap->stream.pipe);
 238         if (ret) {
 239                 vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_QUEUED);
 240                 return ret;
 241         }
 242
 243         ret = vimc_streamer_s_stream(&vcap->stream, &vcap->ved, 1);
 244         if (ret) {
 245                 media_pipeline_stop(entity);
 246                 vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_QUEUED);
 247                 return ret;
 248         }
 249
 250         return 0;
 251 }
 252
 253 /*
 254  * Stop the stream engine. Any remaining buffers in the stream queue are
 255  * dequeued and passed on to the vb2 framework marked as STATE_ERROR.
 256  */
 257 static void vimc_cap_stop_streaming(struct vb2_queue *vq)
 258 {
 259         struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
 260
 261         vimc_streamer_s_stream(&vcap->stream, &vcap->ved, 0);
 262
 263         /* Stop the media pipeline */
 264         media_pipeline_stop(&vcap->vdev.entity);
 265
 266         /* Release all active buffers */
 267         vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_ERROR);
 268 }
 269
 270 static void vimc_cap_buf_queue(struct vb2_buffer *vb2_buf)
 271 {
 272         struct vimc_cap_device *vcap = vb2_get_drv_priv(vb2_buf->vb2_queue);
 273         struct vimc_cap_buffer *buf = container_of(vb2_buf,
 274                                                    struct vimc_cap_buffer,
 275                                                    vb2.vb2_buf);
 276
 277         spin_lock(&vcap->qlock);
 278         list_add_tail(&buf->list, &vcap->buf_list);
 279         spin_unlock(&vcap->qlock);
 280 }
 281
 282 static int vimc_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
 283                                 unsigned int *nplanes, unsigned int sizes[],
 284                                 struct device *alloc_devs[])
 285 {
 286         struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
 287
 288         if (*nplanes)
 289                 return sizes[0] < vcap->format.sizeimage ? -EINVAL : 0;
 290         /* We don't support multiplanes for now */
 291         *nplanes = 1;
 292         sizes[0] = vcap->format.sizeimage;
 293
 294         return 0;
 295 }
 296
 297 static int vimc_cap_buffer_prepare(struct vb2_buffer *vb)
 298 {
 299         struct vimc_cap_device *vcap = vb2_get_drv_priv(vb->vb2_queue);
 300         unsigned long size = vcap->format.sizeimage;
 301
 302         if (vb2_plane_size(vb, 0) < size) {
 303                 dev_err(vcap->ved.dev, "%s: buffer too small (%lu < %lu)\n",
 304                         vcap->vdev.name, vb2_plane_size(vb, 0), size);
 305                 return -EINVAL;
 306         }
 307         return 0;
 308 }
 309
 310 static const struct vb2_ops vimc_cap_qops = {
 311         .start_streaming        = vimc_cap_start_streaming,
 312         .stop_streaming         = vimc_cap_stop_streaming,
 313         .buf_queue              = vimc_cap_buf_queue,
 314         .queue_setup            = vimc_cap_queue_setup,
 315         .buf_prepare            = vimc_cap_buffer_prepare,
 316         /*
 317          * Since q->lock is set we can use the standard
 318          * vb2_ops_wait_prepare/finish helper functions.
 319          */
 320         .wait_prepare           = vb2_ops_wait_prepare,
 321         .wait_finish            = vb2_ops_wait_finish,
 322 };
 323
 324 static const struct media_entity_operations vimc_cap_mops = {
 325         .link_validate          = vimc_vdev_link_validate,
 326 };
 327
 328 void vimc_cap_release(struct vimc_ent_device *ved)
 329 {
 330         struct vimc_cap_device *vcap =
 331                 container_of(ved, struct vimc_cap_device, ved);
 332
 333         media_entity_cleanup(vcap->ved.ent);
 334         kfree(vcap);
 335 }
 336
 337 void vimc_cap_unregister(struct vimc_ent_device *ved)
 338 {
 339         struct vimc_cap_device *vcap =
 340                 container_of(ved, struct vimc_cap_device, ved);
 341
 342         vb2_queue_release(&vcap->queue);
 343         video_unregister_device(&vcap->vdev);
 344 }
 345
 346 static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
 347                                     const void *frame)
 348 {
 349         struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
 350                                                     ved);
 351         struct vimc_cap_buffer *vimc_buf;
 352         void *vbuf;
 353
 354         spin_lock(&vcap->qlock);
 355
 356         /* Get the first entry of the list */
 357         vimc_buf = list_first_entry_or_null(&vcap->buf_list,
 358                                             typeof(*vimc_buf), list);
 359         if (!vimc_buf) {
 360                 spin_unlock(&vcap->qlock);
 361                 return ERR_PTR(-EAGAIN);
 362         }
 363
 364         /* Remove this entry from the list */
 365         list_del(&vimc_buf->list);
 366
 367         spin_unlock(&vcap->qlock);
 368
 369         /* Fill the buffer */
 370         vimc_buf->vb2.vb2_buf.timestamp = ktime_get_ns();
 371         vimc_buf->vb2.sequence = vcap->sequence++;
 372         vimc_buf->vb2.field = vcap->format.field;
 373
 374         vbuf = vb2_plane_vaddr(&vimc_buf->vb2.vb2_buf, 0);
 375
 376         memcpy(vbuf, frame, vcap->format.sizeimage);
 377
 378         /* Set it as ready */
 379         vb2_set_plane_payload(&vimc_buf->vb2.vb2_buf, 0,
 380                               vcap->format.sizeimage);
 381         vb2_buffer_done(&vimc_buf->vb2.vb2_buf, VB2_BUF_STATE_DONE);
 382         return NULL;
 383 }
 384
 385 struct vimc_ent_device *vimc_cap_add(struct vimc_device *vimc,
 386                                      const char *vcfg_name)
 387 {
 388         struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
 389         const struct vimc_pix_map *vpix;
 390         struct vimc_cap_device *vcap;
 391         struct video_device *vdev;
 392         struct vb2_queue *q;
 393         int ret;
 394
 395         /* Allocate the vimc_cap_device struct */
 396         vcap = kzalloc(sizeof(*vcap), GFP_KERNEL);
 397         if (!vcap)
 398                 return NULL;
 399
 400         /* Initialize the media entity */
 401         vcap->vdev.entity.name = vcfg_name;
 402         vcap->vdev.entity.function = MEDIA_ENT_F_IO_V4L;
 403         vcap->pad.flags = MEDIA_PAD_FL_SINK;
 404         ret = media_entity_pads_init(&vcap->vdev.entity,
 405                                      1, &vcap->pad);
 406         if (ret)
 407                 goto err_free_vcap;
 408
 409         /* Initialize the lock */
 410         mutex_init(&vcap->lock);
 411
 412         /* Initialize the vb2 queue */
 413         q = &vcap->queue;
 414         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 415         q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_USERPTR;
 416         q->drv_priv = vcap;
 417         q->buf_struct_size = sizeof(struct vimc_cap_buffer);
 418         q->ops = &vimc_cap_qops;
 419         q->mem_ops = &vb2_vmalloc_memops;
 420         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 421         q->min_buffers_needed = 2;
 422         q->lock = &vcap->lock;
 423
 424         ret = vb2_queue_init(q);
 425         if (ret) {
 426                 dev_err(vimc->mdev.dev, "%s: vb2 queue init failed (err=%d)\n",
 427                         vcfg_name, ret);
 428                 goto err_clean_m_ent;
 429         }
 430
 431         /* Initialize buffer list and its lock */
 432         INIT_LIST_HEAD(&vcap->buf_list);
 433         spin_lock_init(&vcap->qlock);
 434
 435         /* Set default frame format */
 436         vcap->format = fmt_default;
 437         vpix = vimc_pix_map_by_pixelformat(vcap->format.pixelformat);
 438         vcap->format.bytesperline = vcap->format.width * vpix->bpp;
 439         vcap->format.sizeimage = vcap->format.bytesperline *
 440                                  vcap->format.height;
 441
 442         /* Fill the vimc_ent_device struct */
 443         vcap->ved.ent = &vcap->vdev.entity;
 444         vcap->ved.process_frame = vimc_cap_process_frame;
 445         vcap->ved.vdev_get_format = vimc_cap_get_format;
 446         vcap->ved.dev = vimc->mdev.dev;
 447
 448         /* Initialize the video_device struct */
 449         vdev = &vcap->vdev;
 450         vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 451         vdev->entity.ops = &vimc_cap_mops;
 452         vdev->release = video_device_release_empty;
 453         vdev->fops = &vimc_cap_fops;
 454         vdev->ioctl_ops = &vimc_cap_ioctl_ops;
 455         vdev->lock = &vcap->lock;
 456         vdev->queue = q;
 457         vdev->v4l2_dev = v4l2_dev;
 458         vdev->vfl_dir = VFL_DIR_RX;
 459         strscpy(vdev->name, vcfg_name, sizeof(vdev->name));
 460         video_set_drvdata(vdev, &vcap->ved);
 461
 462         /* Register the video_device with the v4l2 and the media framework */
 463         ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
 464         if (ret) {
 465                 dev_err(vimc->mdev.dev, "%s: video register failed (err=%d)\n",
 466                         vcap->vdev.name, ret);
 467                 goto err_release_queue;
 468         }
 469
 470         return &vcap->ved;
 471
 472 err_release_queue:
 473         vb2_queue_release(q);
 474 err_clean_m_ent:
 475         media_entity_cleanup(&vcap->vdev.entity);
 476 err_free_vcap:
 477         kfree(vcap);
 478
 479         return NULL;
 480 }